add deps on header files & stubs

src/gen_rules.ml

@@ -466,6 +466,8 @@ module Gen(P : Params) = struct
     in
     add_rule
       (libs
+       >>>
+       Build.dyn_paths (Build.arr (Lib.archive_files ~mode ~ext_lib:ctx.ext_lib))
        >>>
        Build.run (Dep compiler)
          [ A "-o"; Target target
@@ -753,8 +755,8 @@ module Gen(P : Params) = struct
 
   let lib_archive (lib : Library.t) ~dir ~ext = Path.relative dir (lib.name ^ ext)
 
-  let stubs_archive (lib : Library.t) ~dir =
-    Path.relative dir (sprintf "lib%s_stubs%s" lib.name ctx.ext_lib)
+  let stubs_archive lib ~dir =
+    Library.stubs_archive lib ~dir ~ext_lib:ctx.ext_lib
 
   let dll (lib : Library.t) ~dir =
     Path.relative dir (sprintf "dll%s_stubs%s" lib.name ctx.ext_dll)
@@ -820,7 +822,9 @@ module Gen(P : Params) = struct
        >>>
        Build.fanout
          (expand_and_eval_set ~dir lib.c_flags ~standard:default_c_flags)
-         requires
+         (requires
+          >>>
+          Build.dyn_paths (Build.arr Lib.header_files))
        >>>
        Build.run
          (* We have to execute the rule in the library directory as the .o is produced in
@@ -1039,7 +1043,7 @@ module Gen(P : Params) = struct
       add_rule
         (Build.fanout
            (requires
-            >>> Build.dyn_paths (Build.arr (Lib.archive_files ~mode)))
+            >>> Build.dyn_paths (Build.arr (Lib.archive_files ~mode ~ext_lib:ctx.ext_lib)))
            (dep_graph
             >>> Build.arr (fun dep_graph ->
               names_to_top_closed_cm_files

src/jbuild_types.ml

@@ -409,6 +409,9 @@ module Library = struct
     match t.c_names, t.cxx_names, t.self_build_stubs_archive with
     | [], [], None -> false
     | _            -> true
+
+  let stubs_archive t ~dir ~ext_lib =
+    Path.relative dir (sprintf "lib%s_stubs%s" t.name ext_lib)
 end
 
 module Executables = struct

src/lib.ml

@@ -27,6 +27,17 @@ let dir = function
   | Internal (dir, _) -> dir
   | External pkg -> pkg.dir
 
+let header_files ts =
+  List.fold_left ts ~init:[] ~f:(fun acc t ->
+      match t with
+      | External _ -> []
+      | Internal (dir, lib) ->
+        match lib.public_headers with
+        | [] -> acc
+        | l ->
+          List.fold_left l ~init:acc ~f:(fun acc fn ->
+              Path.relative dir (fn ^ ".h") :: acc))
+
 let include_flags ts =
   let dirs =
     List.fold_left ts ~init:Path.Set.empty ~f:(fun acc t ->
@@ -66,12 +77,18 @@ let link_flags ts ~mode =
        | Internal (dir, lib) ->
          Dep_rel (dir, lib.name ^ Mode.compiled_lib_ext mode)))
 
-let archive_files ts ~mode =
+let archive_files ts ~mode ~ext_lib =
   List.concat_map ts ~f:(function
     | External pkg ->
       List.map (Mode.Dict.get pkg.archives mode) ~f:(Path.relative pkg.dir)
     | Internal (dir, lib) ->
-      [Path.relative dir (lib.name ^ Mode.compiled_lib_ext mode)])
+      let l =
+        [Path.relative dir (lib.name ^ Mode.compiled_lib_ext mode)]
+      in
+      if Jbuild_types.Library.has_stubs lib then
+        Jbuild_types.Library.stubs_archive lib ~dir ~ext_lib :: l
+      else
+        l)
 (*
 let ppx_runtime_libraries ts =
   List.fold_left ts ~init:String_set.empty ~f:(fun acc t ->

src/lib.mli

@@ -12,13 +12,15 @@ module Set : Set.S with type elt := t
 
 (*val deps : t -> string list*)
 
+val header_files : t list -> Path.t list
+
 val include_flags : t list -> _ Arg_spec.t
 
 val c_include_flags : t list -> _ Arg_spec.t
 
 val link_flags : t list -> mode:Mode.t -> _ Arg_spec.t
 
-val archive_files : t list -> mode:Mode.t -> Path.t list
+val archive_files : t list -> mode:Mode.t -> ext_lib:string -> Path.t list
 
 (** [public_name] if present, [name] if not *)
 val best_name : t -> string